In the series premiere, America's toughest trainer, Jillian Michaels, reveals a side of her you never knew- devoted mother, supportive partner, and comedy chops. Jillian travels to the U.K. for work, causing strain on her home life, and upon returning to Los Angeles, Jillian is pressured by her friends to marry her long-term partner.

Jillian heads to NYC to rectify a business deal gone wrong. A family emergency distracts Jillian's focus from work obligations, and after a series of mistakes, Jillian realizes that her assistant may be out of her league. Jillian tries to keep it together, despite everything working against her.

Jillian invests time and money into a potential protégé, while her business partner looks to expand her brand outside of fitness. When Jillian's son has to have a tonsillectomy, she struggles to find balance between the role of mother, and provider.

When G leaves town Jillian learns she will have to manage several work events without her trusted business partner and is forced to confront issues with her half-sister. Jillian and her fitness team go to Chicago for a workout convention, but when things get wild, they all pay the price.

Jillian works with the Clinton foundation to combat childhood obesity before heading down to Florida for her mother-in-law's 70th birthday. On a mission to win her over, Jillian plans a party full of expensive, and risqué surprises, in order to make it a birthday bash nobody will ever forget.

Jillian decides that her in-laws are part of a party-loving retirement community and surprising them with strippers and alcohol might be the way to their hearts. Later, a trip to Miami doesn't go as expected.

Jillian officiates a wedding for the first time in her life, an experience Heidi hopes will change Jillian's mind about marriage. Also: the two moms take a different approach when dealing with a preschool bully.

Jillian expands her empire and proves that she's more than just a fitness guru, by landing a deal with Cosmopolitan magazine in the Season 1 finale. Meanwhile, Jillian's protégé is put to the ultimate test, during a live workout.